Blast-furnace



C. STEIN.

BLAST FURNACE.

APPLICA'HON FILED MAY 18,1917.

1 1,347,796. Patented July 27,1920.

3 SHEETS-SHEET 1'- C. STEIN.

L/\S'T FURNACE.

APPLICATION FILED MAYI8. 1911.

1,Z 47,796.v Patented July 27,1920.

3 SHEETS-SHEET 2.

C. STEIN.

BLAST FURNACE.

APPLICATION FILED MAY 18, 1917.

1,347,79 PatentedJuly 27 0.

SHEETS-SHEE UNITED STATES PATENT OFFICE.-

CHARLES STEIN, 0F PARIS, FRANCE, ASSIGNOR TO SOGIETE CH. IVL STEIN & GIE., OF

PARIS, FRANCE, A CORPORATION OF FRANCE.

BLAST-FURNACE.

Specification of Letters Patent. Patented J uly 2'7, 1920.

Application filed May 18, 1917. Serial No. 169,469.

I '0 all whom it may concern:

Be it known that I, CHARLns STEIN, engmeer, of 3 Rue dltdimbourg, at Paris, Department of the Seine, France, citizen of the French Republic, have invented certain new and useful Improvements in or Relating to Blast-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It has been amply demonstrated that the consumption of the fuel, coke, in a blastfurnace, is, all things being equal in other respects, reduced in proportion as the air led to the twyers is hotter.

The temperature to which the air is heated is moreover limited by the temperature to which the checker-work of the stoves of the Cowper or IVhitwell type employed at the present day can be raised.

In the heating stage of these stoves, the temperature to which the air can be raised is limited by the fact that in the usual practice the stoves are heated by burning therein 00% blast-furnace gas by air which is also co The temperature of the checker-work can certainly be substantially raised in the Cowper or other stoves, by burning cold or previously heated gas, therein by means of hot air. Consequently since these devices operate during the hot-blast period, that is to say during the time, when, after accumulating heat, they give the latter up, the heat given up to the blast conducted to the twyers of the blast-furnace is substantially increased. In this way the fuel mixed with the ore and with the limestone flux can be economized.

To put this improvement into operation all that is necessary is to take away a part of the surplus of the gas from the blastfurnaces and to burn this gas for the pur pose of heating a regenerating stove of one of the known types, or even stacks of bricks similar to the Cowper stove. The air or the gas, or else the air and the gas, which are subsequently to serve by their combustion for the heating of the Cowper or other stoves, are then passed into the regenerators of the checker-work.

The invention may be put into operation in the following manner:

Figure 1 shows a longitudinal section,

F ig. 2 across section and Fig. 3 a plan of one of the stoves that may be employed.

The blast-furnace gas or any other gas coming either from gas-producers or from coke ovens, arrives by the conduit 1 and by the flue 2. It comes to the combustion chamber 8, where. it is burnt by the air which is conducted into this chamber 3 through the fines 6. i

The products of the combustion circulate in a continuous regenerator and through the flues l, and are discharged to a chimney 5. The air or gas intended for heating the Cowper or other stoves enters the regenerator through the flue? and after being heated in contact with the sides of the fines in which the gaseous products of combustion just referred to are circulating, it reaches the Cowper or other hot-air stoves by traversing the chambers 8, the fiues 9 and suitable valves.

Instead of employing continuously operating regenerators, like those just considered, another form of the invention consists of-employing checker-work like that of the Cowper and other stoves. Cowper stoves or similar apparatus can also sometimes be I utilized by burning the gas with the air coming from a by-pass pipe branched on to existing Cowper stoves, and this can be done in the event of the number of existing Cowper stoves becoming superabundant in consequence of the diminution in the consumption of coke and in consequence of the quantity of blast-air to be blown into the furnaces, or in consequence of the higher temperature of the Cowper stove.

I claim:

A device for heating air or gas for use in a stove of the Cowper or Whitwell type,

comprising a chamber communicating with the stove, an air or gas inlet for such chamber, a combustion chamber, a conduit for supplying the combustion chamber with combustible gas, an air conduit leading from the air. inlet to the combustion chamber, and

a conduit communicating with said combustion chamber and surrounding said first mentioned chamber.

In testimony whereof I aiiix my signature, in presence of two witnesses. CHARLES STEIN.

Witnesses:

T'IENRI COHEN, CHAS. P. PRESSLY. 

